Battery charger



FIG. 1 is a perspective view of the battery charger;

FIG. 2 is a side view thereof from the left of FIG. 4;

FIG. 3 is a side view thereof from the right of FIG. 4;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a battery charger, as shown. 